I getting some headers for x-mas and am going to fab up a true duel exhaust. My question is, do I need 1 cat/O2 sensor per side? Or can I get away with no cats? Can I put 1 O2 sensor in the equalizing tube? If I do need cats/ O2 sensors what is the best bang dor the buck and were can I find them. Any other suggestions or comments regaurding exhaust gladly excepted.